/**
 * A Context to record variable value
 */

import java.util.*;

public class Context {
    private Hashtable context = new Hashtable();

    public void Assign(String name, boolean val) {
        context.put(name, new Boolean(val));
    }

    public boolean LookUp(String name) {
        return ((Boolean) context.get(name)).booleanValue();
    }

    public Context() {
    }
}